Viking Pump TSM710.1: HLE-ALE 4076/4176 - Manual (Page 6)

SECTION TSM 710.1 ISSUE C PAGE 6 OF 8
MeCHANiCAL SeAL
DANger !
before starting the pump, be sure all drive
equipment guards are in place.
failure to properly mount guards may
result in serious injury or death.
For disassembly, see “DiSASSeMbLy” on page 4.
For assembly, see “ASSeMbLy” on page 4.
NOTe: Never touch the mechanical seal faces with anything
except clean hands or a clean cloth. Minute particles can
scratch the seal faces and cause leakage.
Always clean the rotor and shaft and seal housing bore
before installing the mechanical seal. Make sure surfaces
are clean and free of scratches.
There are two available mechanical seals. The standard
features a cup type seat. A “pin style” seal is also available
that has the seal seat pinned to prevent rotation. This design
is used for viscosities higher than 750 cPs.
THruST beAriNg ADJuSTMeNT
See figure 4 on page 3.
1. Loosen the two setscrews in the outer face of the
bearing housing and turn the thrust bearing assembly
clockwise until it can no longer be turned by hand. Back
off counterclockwise until the rotor shaft can be turned
by hand with a slight, noticeable drag.
2. For standard end clearance, back off the thrust bearing
assembly the required length as measured on the outside
diameter of the bearing housing (See Table 3).
3. Tighten the two self locking type “Allen” setscrews in the
outboard face of the bearing housing. Tighten each with
equal force against the bracket. The pump is now set
with standard end clearance.
PuMP
SiZe
STANDArD eND
CLeArANCe
(mm)
LeNgTH ON OD* (mm) fOr
STD.
eACH .025 mm
ADDiTiONAL
HLE .08 12 4
ATE .08 15 5
ALE .08 15 5
* Turn bearing housing CCW this distance to obtain either
standard or additional end clearance.
iNSTALLATiON Of CArbON
grAPHiTe buSHiNgS
When installing Carbon graphite bushings, extreme care
must be taken to prevent breaking. Carbon graphite is a
brittle material and cracks easily. If cracked, the bushing will
quickly disintegrate. Using a lubricant on the bushing and the
mating part will help in installation. The additional precautions
listed below must be followed for proper installation:
1. A press must be used for installation.
2. Be certain the bushing is straight.
3. Do not stop the pressing operation until the bushing is in
the proper position, starting and stopping will result in a
cracked bushing.
4. Check the bushing for cracks after installation.
iNSTALLATiON Of fOOT
Series 4176 pumps come equipped with a removable foot.
Removal of the foot is not normally required for maintenance.
In cases where the foot needs to be replaced or is being
added, use the following steps.
1. Ensure alignment pins are installed in the top of the foot
prior to assembly of the foot to the casing.
2. Match the foot to the casing by inserting pins into the
bottom of the casing.
3. Secure foot to casing using the socket head capscrews
and lock washers. Torque capscrews to 100-110 N•m.
figure 7
TAbLe 3
NOTe: Be sure the shaft rotates freely. If it doesn’t,
repeat the above procedure.
4. High viscosity liquids require additional end clearances.
The amount of extra clearance depends on the viscosity
of the liquid pumped. For specific recommendations,
consult the factory. Table 3 shows the bearing housing
adjustment required for additional end clearance as well
as values for standard end clearance.